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Re: my cmdline tests are extremely slow

From: C. Michael Pilato <cmpilato_at_collab.net>
Date: Thu, 30 Oct 2008 10:49:11 -0400

Neels J. Hofmeyr wrote:
>
> Stefan Sperling wrote:
>> On Thu, Oct 09, 2008 at 07:28:43AM +0200, Neels J Hofmeyr wrote:
>>> Also, I haven't actually checked *all* of the commandline tests. It takes
>>> ages to complete, with apparent longer breaks of doing nothing at all, when
>>> watching the CPU and disk activity.
>>>
>>> And then I have to run it twice, once for trunk and once for my patch, to be
>>> able to compare test outcomes. How do you handle this kind of situation?
>> Use a RAM disk to host temporary test data.
>> See http://subversion.tigris.org/faq.html#ramdisk-tests
>
> So I did that. But still, running merge_tests.py --cleanup in the ramdisk
> has random pauses of all activity for sometimes as much as 15 seconds.
> That's ridiculous. Why can't it just race through the tests, idling at most
> a second at a time? Why is my CPU staying cold?
>
> I've also seen that if I run a single test, it goes swiftly. Then, if I run
> a whole list of them, there appear to be completely random pauses between
> the tests sometimes, and sometimes not. It's weirding me out...

I'm guessing it's a lack of entropy? See if during your pauses things go
faster when you jiggle your mouse. (And then try compiling APR with
--with-devrandom=/dev/urandom so you don't have to do said jiggling all the
time.)

-- 
C. Michael Pilato <cmpilato_at_collab.net>
CollabNet   <>   www.collab.net   <>   Distributed Development On Demand

Received on 2008-10-30 15:49:19 CET

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